User can register with email address -- doc error

OK. Thanks.

Just to explain why I want this functionality - there is still a chance for ambiguity although it is highly improbable.

User 1:
username: A
email address: a[at]b[dot]com

User 2:
username: a[at]b[dot]com
email address: any other email address which is not used in our system so far

If both of them want to login using a[at]b[dot]com, one of them gets error message even though he/she uses correct password.

Sorry, I re-read it twice and can't find the reason why I am incorrect.

It seems like we are talking about the same thing but can't find agreement. I try to explain it my way.

- I am using default Drupal registration form with 2 input fields - "Username" and "E-mail address"

- In my opinion when we allow user to login using his/her username OR e-mail address we should check 4 rules in registration process to avoid ambiguity:
1. If given username is unique among all registered usernames - this is done, no doubt about it
2. If given email address is unique among all registered email addresses - this is done, no doubt about it
3. If given username is unique among all registered email addresses - this doesn't work for me
4. If given email address is unique among all registered usernames - this doesn't work for me

- In #1 you stated "the only thing the module does is prevent a user from registering with an email address that another user has already used as their email address". This covers rule 2, it works fine, no problem.

- In #5 you stated "LT won't allow a username which already exists as an email address for another user". This covers rule 3, it doesn't work for my LT version and configuration. The reason follows.

- I have done an experiment to simulate rule 3 using scenario from #2:
1. Successfully register user with username "A" and email address "a@b.com".
2. Login as admin and change password for user with username "A" registered in step 1 to "d1".
3. SUCCESSFULLY register user with username "a@b.com" and email address "c@d.com" - no validation error as you stated in #5
4. Login as admin and change password for user with username "a@b.com" registered in step 3 to "d2".
5. Try to login with "A" and password "d1" - works OK
6. Try to login with "c@d.com" and password "d2" - works OK
7. Try to login with "a@b.com" and password "d1" - works OK
8. Try to login with "a@b.com" and password "d2" - failed with message "Sorry, unrecognized username or password. Have you forgotten your password?"

- Same experiment with same result can be done for rule 4.

- Possible solutions:
1. I am using old LT version. My version is 5.x - 1.1.
2. I have bad LT configuration. I am using default configuration except enabled "Allow users to login using their e-mail address".
3. Rule 3 and 4 are not supported in LT and you were incorrect saying "LT won't allow a username which already exists as an email address for another user".

Take care and happy new year..:-)

As for rule #3, I had an old LT version (Login Toboggan version: 1.83.2.9 , 2007/07/12 01:18:47). After upgrading to Login Toboggan version: 1.83.2.30 , 2007/12/29 02:55:18 it works also for me. It was my bad but i didn't know there was a new release...